I'm subscribing to this thread for future reference/insight. Am currently using the Intuos5 wireless 8x11 which is pretty fantastic. Used to own a Cintiq 17" that was more trouble than it was worth. Nothing will ever beat physical mediums until price points catch up to technology, and I don't see it happening soon.
Everything I could say about this subject has been discussed already, so no reason for me to hijack the thread. Only advice I can give is from my own experience; drawing on a screen that was tethered to my computer was a waste of $4k. That Yiynova looks sweet for the price. But again, anything tethered needs some serious consideration before investment.
Good luck, guys. I'll keep an eye on this thread and drop any leads if the ever elusive threshold of price vs functionality presents itself. 12yr journey for me so far! Cheers^^